diff --git a/ci/test/00_setup_env.sh b/ci/test/00_setup_env.sh
index 6040804a9..1f485fbec 100755
--- a/ci/test/00_setup_env.sh
+++ b/ci/test/00_setup_env.sh
@@ -6,6 +6,12 @@
 
 export LC_ALL=C.UTF-8
 
+# The root dir.
+# The ci system copies this folder.
+# This is where the build is done (depends and dist).
+BASE_ROOT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )"/../../ >/dev/null 2>&1 && pwd )
+export BASE_ROOT_DIR
+
 echo "Setting specific values in env"
 if [ -n "${FILE_ENV}" ]; then
   set -o errexit;
@@ -13,12 +19,6 @@ if [ -n "${FILE_ENV}" ]; then
   source "${FILE_ENV}"
 fi
 
-# The root dir.
-# The ci system copies this folder.
-# This is where the build is done (depends and dist).
-BASE_ROOT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )"/../../ >/dev/null 2>&1 && pwd )
-export BASE_ROOT_DIR
-
 echo "Fallback to default values in env (if not yet set)"
 # The number of parallel jobs to pass down to make and test_runner.py
 export MAKEJOBS=${MAKEJOBS:--j4}
diff --git a/ci/test/00_setup_env_native_tsan.sh b/ci/test/00_setup_env_native_tsan.sh
index f7a16206a..e9b7a7bba 100644
--- a/ci/test/00_setup_env_native_tsan.sh
+++ b/ci/test/00_setup_env_native_tsan.sh
@@ -11,3 +11,7 @@ export PACKAGES="clang llvm python3-zmq qtbase5-dev qttools5-dev-tools libevent-
 export NO_DEPENDS=1
 export GOAL="install"
 export BITCOIN_CONFIG="--enable-zmq --disable-wallet --with-gui=qt5 CPPFLAGS='-DARENA_DEBUG -DDEBUG_LOCKORDER' --with-sanitizers=thread --disable-hardening --disable-asm CC=clang CXX=clang++"
+
+# xenial comes with old clang versions that can not parse the sanitizer suppressions files
+# Remove unparseable lines as a hacky workaround
+sed -i '/^implicit-/d' "${BASE_ROOT_DIR}/test/sanitizer_suppressions/ubsan"